Talk:PPM Meter Alt

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Has anyone got PCB's available for this design?

Hi All, has anyone cut PCBs from isabella's eagle files for the PPM meter?

Do you have any available?

If so please indicate here on the wiki, If I dont hear a response here in 2 or 3 weeks, this will give me time to build up a bread board version to see if I can multiplex probe inputs with a 4067 or 4050 and to add this to the 2650 MEGA designs ,same story on PH probe circuits , the general Idea is to have a Open Circuits PCB already setup compatible with the arduino bootloader that can then be used to monitor PPM/PH in Artificial reef scenarios or to control medical/recreational Hydroponic setups(that being said I am lazy I prolly wont go through all of this if PCB's for the PPM meter are available to populate :)

gwen

Btw this design http://www.nano-reef.com/forums/index.php?act=attach&type=post&id=91001 supposedly uses both the PPM design and the PH design by isabella incorporated with a ATMEGA644P/1284P PDIP and through hole design for easy hand soldering. Check the forum for author and Creative Commons licensing Commercial Exploitation encouraged!!(needs to be multiplexed and relaid for smt assembly).. gwen

Any updates? I'm seeing lots of started projects, but nothing completed. Not that that's unusual, my life is one series of unfinished projects after another. But I'm really curious to see if anyone has come up with an elegant design that is reliable and durable. I'd like to see an Arduino shield that could be used to automate hydroponic farming. One of the barriers for entry for small-scale urban farmers (one of the reasons the vast majority of hydroponic produce comes from a single farm in Arizona) is the complexity of balancing the indoor climate (temperature, humidity, air movement, ventilation), the timing and intensity of supplemental lighting when the days are short (and hot lights interacting with the climate), and then the water and chemistry and pollination. The commercial control systems available are outrageously priced, clunky to use, unscalable, not networked, and not comprehensive. You end up with several independently controlled but physically dependent systems and the whole thing gets very touchy. Not to mention pollination, which has to be done when conditions are just right or else you're wasting effort and tiring out your bumble bees (or wearing out your Sonicare toothbrush if you're really small scale like me). -Mike 71.237.45.1 14:53, 14 June 2011 (EDT)

Conductivity meter kit

I like what youve done and want to see more. I did play extenssivly with my own little design and soon i will post the schematics. My tds meter operates on a single 9 to 16v dc supply or even 9 volt battery. PCB and a kit is available for purchase if interested. My tds meter measures 0 to 200 umhos with stainless steel probes ( i used ss screws) or 500 to 5000 umhos by using graphite tips. Out put voltage for 0-200umhos is 0 to 200mv (i used a digital lcd voltmeter display ,works perfect) 500-5000umhos 0-5v . Design uses single chip tlo64 op-amp.